Adjustable cut-off



(No Model.)

' W. F. PARISH.

ADJUSTABLE GUT-OFP. l No. 363,255. Patented May 17, 1887.

l f Mmiwmu .vice on the stem of the cut-off valve.

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\VILLlAM F. PARISH, OF MINNEAPOLS, MINNESOTA.

ADJUSTABLE CUT-OFF.

SPECIFICATION forming part of Letters Patent No. 383,255, dated May 17,1887.

Y Application iiled February 2], 1887. ScrialNo. 228,311. (No model.)

To aZZ whom it may concern.-

Be it known that I, WILLIAM F. PARISH, of Minneapolis, in the county ofHennepin, State of Minnesota, have invented certain Improve ments inAdjustable Out-Offs for Engines, of which the following is aspecification.

This invention relates to improvements in the adjusting mechanism ofcut-off valves of steam-engines,- andthe objects I have inview are toprovide a cheap, simple, strong, and durable mechanism by which thevalve may be accurately adjusted to cut oft` the steam at any desiredpoint in the stroke and indicate the point of the stroke at or nearwhich the steam will be cut off. These objects I accomplish by means ofthe construction hereinafter described, and particularly pointed out inthe claims.

In the drawings, Figure 1 is a side eleva` tion of a portion of anengine Vbed-frame and cylinder having my improved device appliedthereto. Fig. 2 is a horizontal section of a valve, with a plan View ofmy adjusting de- Fig. 3 is a side elevation, onalarger scale, of theadjusting device. Fig. 4 is a sectional end elevation of the same. Fig.5 is a plan view of the same. Fig. 6 is a detail.

In the drawings, 2 represents a portionof the bed-frame of asteam-engine, and 3 a portion -or" the steam-chest. These parts may beof any suitable or preferred construction. The steamchest is providedwith a sliding valve, 7, that is operated by a rod, 9, in the usual way.The steam-chest is also provided with a rider or cutoff valve consistingof the two slides 11 and 13, one for each steam-port in the main valve.These slides are each con- -`nected to a rod, 15, which is provided withlawa at each side to this o eninfr. as shown in Figs. 3 and 4.v

A revolving head, 23, is adapted to iit the opening in the arm 21, andis provided at one end with a hexagon, 25, and an annular shoulder, 26,that is adapted to bear against the end of the arm 2l. The end of therevclvinghead is provided with a suitable opening, which is adapted toreceive the end of the valve-stem 15, which is secured thereto by a pin,27, or other suitable means. The opposite end of the head 23 is providedwith a screw-thread, 28, as shown in Fig. 6. l

A sleeve, 29, is provided with an external screw thread and with aninternal thread adapted to t the thread 28 on the head 23. This sleevemay, however, be secured to the head by any suitable means.

A slide, 30, is arranged in ways 31 on the face of the arm 21, and'isprovided with an inturned end, 32, hav-ing sections of screwthreads thatengage the threads on the sleeve 29. This slide is provided with a slot,33, in the direction of its length, through which a clamping-screw, 34,passes. By means or" this screw the slide may be clamped and locked inany desired position. The slide is provided with a suitable pointer, 36,and a scale is marked on the face of the arm 21, along which the pointeris moved as the valve is adjusted. The pointer may be omitted, ifpreferred, and a mark may be made on the slide to serve the samepurpose.

In putting the device together the slide 30 may first be put in placeand secured by the screw 34:. The sleeve 29 may then be inserted throughthe opening in the opposite side of the arm 21 and its threads be madeto engage with the sectional threads on the inturned portion of theslide. The revolving head 23 is then inserted through the opening in theend of the arm and screwed into the sleeve 29. After this head isbrought to the proper position a pin, 35, may be passed through thesleeve and the head, thus permanently securing these parts together. Ifpreferred, the threads on the head 23 and the internal thread in thesleeve may be omitted andthe sleeve secured by a pin or other device.The end of the valve-stein 15 is then secured to the end of IOO thehead. The head 23 and sleeve 29 may first be put in position, and thenthe slide 30 may be put in place and its threaded end be entered uponthe threads of the sleeve 29.

By applying a Wrench to the heXagon on the head 23 and turning the samethe valve-stem will also be turned and the cutoff valve will beadjusted. The slide will be moved by the threads on the sleeve 29engaging the threads on the inturned end of the slide, and the positionof the'pointer on the scale will indicate substantially the point in thestroke at which the steam will be cut off. For

, instance, for a fifteen-inch cylinder the scale d may be marked 3%,7%, 111i-, to indicate a cut slide is limited by the screw 34, and asits movement limits the movement of the other part-s, 1t will beimpossible for an engineer or attendant to carelessly move the parts soas to get them out'of working position, except by iirst removing theclamping-screw and disengaglng the slide from the threaded sleeve.

This adjusting device can be applied to any positive-movement cut-offvalve, whether a rocker-arm is used for moving it or not, and either toa valve having two slides, such as shown, or to a valve havinga singleslide.

The scale may be on the slide and the pointer on the arm 21, ifpreferred.

I claim as my invention- 1. The combination, with the valve-stern, ofthe adjusting and indicating mechanism, consisting of the arm 21, therevolving head 23, to which the valve-stem is connected, the threadedsleeve 29, secured to said head, and the slide 30, engaging said sleeveand operated thereby, substantially as described.

2. The combination, with the valve-stem, of the arm 21, the revolvinghead 23, connected with said stem, the threaded sleeve 29 on said head,the slide 30,engaging said sleeve, the indicating-scale, and theelamp'ingscrew 34, all substantially as described.

3. The combination, with the valvestem, of the revolving head 23. theslide operated by said head, and the indicating-scale, substantially asdescribed.

In testimony whereof I have hereunto set my Ahand this 17th day ofFebruary, 1887;

WILLIAM F. PARISH.

